:root{
  --primary:#4a7aff;
  --primary-dark:#3d6ef5;
  --bg:#f5f6f8;
  --card:#fff;
  --text:#1f2329;
  --text-2:#646a73;
  --text-3:#8f959e;
  --line:#e8eaed;
  --radius:14px;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
[hidden]{display:none !important}
html,body{margin:0;height:100%;overflow:hidden}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:15px;color:var(--text);background:var(--bg);
  -webkit-font-smoothing:antialiased;overscroll-behavior:none;
}
button{font-family:inherit}

/* ── 启动页 ── */
.boot{
  position:fixed;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:14px;background:linear-gradient(160deg,#eef3ff 0%,#f7f8fa 55%,#eef1f5 100%);
}
.boot__logo{font-size:44px;line-height:1}
.boot__text{margin:0;color:var(--text-2);font-size:14px}
.boot__dots{display:flex;gap:6px}
.boot__dots i{width:6px;height:6px;border-radius:50%;background:var(--primary);opacity:.25;animation:blink 1.2s infinite}
.boot__dots i:nth-child(2){animation-delay:.2s}
.boot__dots i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.2}40%{opacity:1}}

/* ── 布局 ── */
.chat{position:fixed;inset:0;display:flex;flex-direction:column;background:var(--bg)}
.chat__head{
  flex:0 0 auto;display:flex;align-items:center;gap:11px;
  padding:calc(10px + var(--safe-t)) 14px 10px;
  background:linear-gradient(100deg,#5b8cff 0%,#4a7aff 60%,#3d6ef5 100%);
  color:#fff;box-shadow:0 2px 12px rgba(61,110,245,.3);z-index:5;
}
.chat__avatar{
  width:40px;height:40px;border-radius:50%;flex:0 0 auto;
  display:flex;align-items:center;justify-content:center;
  background:rgba(255,255,255,.24);border:1.5px solid rgba(255,255,255,.7);
  font-size:16px;font-weight:600;
}
.chat__info{flex:1;min-width:0}
.chat__name{font-size:16px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat__status{font-size:12px;opacity:.88;margin-top:2px;display:flex;align-items:center;gap:4px}
.chat__status::before{content:"";width:6px;height:6px;border-radius:50%;background:#b7eb8f}
body[data-online="0"] .chat__status::before{background:rgba(255,255,255,.45)}
.chat__act{
  width:32px;height:32px;border:0;border-radius:50%;background:rgba(255,255,255,.18);
  color:#fff;font-size:15px;cursor:pointer;flex:0 0 auto;
}
.chat__act:active{background:rgba(255,255,255,.32)}

.chat__body{flex:1;overflow-y:auto;overflow-x:hidden;padding:14px 12px 6px;-webkit-overflow-scrolling:touch}
.msgs{list-style:none;margin:0;padding:0}

/* ── 消息 ── */
.msg{display:flex;flex-direction:column;margin-bottom:12px;animation:fade .2s ease}
.msg--out{align-items:flex-end}
.msg--in{align-items:flex-start}
.msg--sys{align-items:center}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

.bubble{
  max-width:min(78vw,420px);padding:9px 13px;border-radius:12px;
  font-size:15px;line-height:1.5;word-break:break-word;white-space:pre-wrap;
  box-shadow:0 1px 2px rgba(0,0,0,.04);
}
.msg--in .bubble{background:#fff;border:1px solid var(--line);border-bottom-left-radius:4px}
.msg--out .bubble{background:linear-gradient(135deg,#5b8cff,#4a7aff);color:#fff;border-bottom-right-radius:4px;box-shadow:0 2px 8px rgba(74,122,255,.28)}
.bubble a{color:inherit}
.e-inline{width:1.25em;height:1.25em;vertical-align:-0.22em;margin:0 1px;display:inline-block}
.bubble--media{padding:4px;background:#fff;border:1px solid var(--line);max-width:min(66vw,340px)}
.bubble--media img{display:block;max-width:100%;max-height:300px;border-radius:9px;cursor:zoom-in}
.bubble--media video{display:block;max-width:100%;max-height:320px;border-radius:9px;background:#000}
.time{font-size:11px;color:var(--text-3);margin-top:4px;padding:0 4px}
.sys{
  font-size:12px;color:var(--text-2);background:rgba(0,0,0,.05);
  padding:6px 14px;border-radius:20px;text-align:center;max-width:88%;
}

/* ── 输入区 ── */
.chat__foot{flex:0 0 auto;background:#fff;border-top:1px solid var(--line);padding:8px 12px calc(8px + var(--safe-b))}
.bar{display:flex;gap:4px;margin-bottom:6px}
.bar__btn{
  width:38px;height:38px;border:0;background:transparent;border-radius:10px;
  display:inline-flex;align-items:center;justify-content:center;
  color:#5b6472;cursor:pointer;padding:0;
  transition:background .16s,color .16s,transform .12s;
}
.bar__btn svg{display:block}
.bar__btn:hover{background:rgba(74,122,255,.09);color:var(--primary)}
.bar__btn:active{transform:scale(.9)}
.bar__btn.active{background:rgba(74,122,255,.13);color:var(--primary)}
.compose{display:flex;align-items:flex-end;gap:8px;background:#f4f5f7;border-radius:20px;padding:6px 6px 6px 14px;border:1px solid transparent}
.compose:focus-within{background:#fff;border-color:rgba(74,122,255,.4);box-shadow:0 0 0 3px rgba(74,122,255,.1)}
#input{
  flex:1;min-width:0;border:0;background:transparent;outline:0;resize:none;
  font-size:15px;line-height:1.45;max-height:104px;min-height:26px;padding:5px 0;color:var(--text);font-family:inherit;
}
#input::placeholder{color:#b6b9be}
.send{
  flex:0 0 auto;height:36px;min-width:68px;padding:0 18px;border:0;border-radius:18px;
  background:linear-gradient(135deg,#5b8cff,#4a7aff);color:#fff;font-size:14px;font-weight:600;cursor:pointer;
  box-shadow:0 2px 8px rgba(74,122,255,.35);
}
.send:disabled{opacity:.5;box-shadow:none;cursor:default}
.send:active:not(:disabled){transform:scale(.96)}

/* ── 表情 ── */
.emoji{
  display:grid;grid-template-columns:repeat(8,1fr);gap:2px;
  max-height:168px;overflow-y:auto;padding:8px;margin-bottom:6px;
  background:#fff;border:1px solid var(--line);border-radius:12px;
  box-shadow:0 8px 24px rgba(20,35,70,.08);
  animation:pop .16s cubic-bezier(.22,1,.36,1);
}
@keyframes pop{from{opacity:0;transform:translateY(8px) scale(.98)}to{opacity:1;transform:none}}
.emoji::-webkit-scrollbar{width:4px}
.emoji::-webkit-scrollbar-thumb{background:rgba(0,0,0,.12);border-radius:4px}
.emoji button{
  height:40px;border:0;background:transparent;font-size:21px;line-height:1;cursor:pointer;border-radius:9px;padding:0;
  transition:background .12s,transform .12s;
}
.emoji button:hover{background:#f0f4ff;transform:scale(1.1)}
.emoji button:active{background:#e4ecff;transform:scale(.96)}
.emoji button img{width:28px;height:28px;display:block;margin:0 auto;pointer-events:none}

/* ── 正在输入 ── */
.typing{font-size:12px;color:var(--text-3);padding:2px 6px 8px}
.typing span{animation:blink 1.2s infinite}
.typing span:nth-child(2){animation-delay:.2s}
.typing span:nth-child(3){animation-delay:.4s}

/* ── 预览 ── */
.lightbox{
  position:fixed;inset:0;z-index:99;display:flex;align-items:center;justify-content:center;
  background:rgba(0,0,0,.86);
}
.lightbox img{max-width:94vw;max-height:90vh;border-radius:8px}

/* ── 提示 ── */
.toast{
  position:fixed;left:50%;bottom:92px;transform:translateX(-50%);z-index:100;
  background:rgba(0,0,0,.78);color:#fff;font-size:13px;padding:9px 16px;border-radius:20px;
  max-width:82vw;text-align:center;
}

/* ── 桌面 ── */
@media (min-width:769px){
  body{background:#e9edf3}
  .chat{
    top:50%;left:50%;right:auto;bottom:auto;transform:translate(-50%,-50%);
    width:min(880px,94vw);height:min(680px,92vh);border-radius:16px;overflow:hidden;
    box-shadow:0 24px 70px rgba(20,35,70,.18);
  }
  .chat__head{padding:12px 18px}
  .bubble{max-width:min(60%,420px)}
  .chat__body{padding:18px 20px 8px}
  .chat__foot{padding:10px 18px 12px}
  .emoji{grid-template-columns:repeat(12,1fr)}
}